When I did my transition from captain 747-400 to 777 the most interesting difference I noted was aileron control. On the 747-400 on finals you could move the aileron control wheel quickly from neutral to full left, then to full right and back to neutral again without major roll resulting from this input. On the 777 however a similar roll input would flip the whole aircraft from 30 degree left to 30 degree right bank, setting the stage for overcontrolling the roll axis. The only way to stop this is just holding the controls steady neutral for a couple of seconds. Why this happens is the question but my guess is fly by wire sensitivity and larger deflection of the control surfaces compared to the 747 design.